2017-03-08 BUD17 HPC Meeting Minutes

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Last updated: Mar 16, 2017
3 min read

Attendees

Larry - Cavium

Kangkang - Huawei

Tianghong - Huawei

Thomas - ARM

Sean - Qualcomm

Takeharu - Fujitsu

Scott Hare - Qualcomm

David Brash - ARM

Renato - Linaro

Gema Gomez - Linaro

Graeme G - Linaro

Ganesh Raju - Linaro

Anoop S - Linaro

Kanta Vekaria- LInaro

Mike Holmes - Linaro

Francois - Linaro

Martin - Linaro

Agenda

Minutes

Overall topics

Kanta: Waiting for ARM to release spec before we can schedule tasks for optimising SVE.

Renato: For now, Linaro's SVE plan is to just “review patches when they come”. But there is lot to be done before even looking at SVE elsewhere.

Larry: Enough low hanging fruit in HPC now, SVE is not a priority.

Kanta: how important is SVE enablement for QEMU?

Fujitsu: Important for us.

Tianghong: Enabling in OpenHPC a priority!

Kanta: Linaro can do initial analysis

Question: Do we have a plan for multi arch aarch64 microarchitecture support (ie ThunderX vs other Hisilcon)

Renato: asked if this is per system, per cluster or other deciding point. Need to chose how this is transparent for OpenHPC.

Kanta: Key focus area is OpenHPC

From Linaro next step is to:

  • Investigate what is in OpenHPC
  • Build list of libraries needed

TCWG

Initial focusing on LLVM Compiler:

  • (Loop optimization & OpenMP)
  • FASTMath is not the same as in LLVM vs GCC
  • We need some kind of benchmarks for HPC
  • Doing single and double precision, not worrying about half precision (but should be fine)
  • Starting to make sure all the libraries are available into OpenHPC (libc++, libomp, etc)

Talking to Intel on what is missing in OpenMP and talking to ARM about performance

  • Libomp Missing component for OpenMP 4.0 is Offloading, Intel working on it

Larry: Is there any defined process for OpenHPC. Need Eric’s help

Kanta: Eric is on the TSC and I've been attending the SC calls.

With SVE will collaborate with ARM and upstream libraries.

Make sure they are complete for LLVM/GCC.

It will take a few months to get there, hopefully for GCC 8 / LLVM 5

Looking at SVE support in GDB.

GCC engineers are also working LLVM and optimisations are made in both at the same time.

Resources: With past experience, proposal is to work with member engineers and technically lead them

Others

Tianghong: Do we have a plan for “”open community runtime””, It’s for application, inclu OSN. And plan for benchmark (European Conference on Applications of Surface and Interface Analysis (ECASIA)).

Kanta: Maybe in the future we should look at the OCR efforts and compare with OpenHPC and see if it can be combined.

Benchmarking - UEABS

Action: Eric V(ARM) to highlight what benchmarks are in openHPC

TCWG: Benchmark shows libomp performances better than libgomp but libgomp is more compliance and libgomp comes with GCC.

If the libraries are not available use libgomp and if performance is needed move to libomp.

Will start working on this, once received feedback from HPC, move all LLVM libraries to OpenHPC

Martin: Priority to start with Overlay, PPA

Actions

  1. Re-evaluate OpenHPC in terms of efforts, missing pieces, roadmap

  2. Benchmarking : Need expertise from the people who are doing this

    1. Benchmarking sIngle or multi node

    2. Understand workloads and parameters